High frequency circuit element and high frequency circuit module

Abstract

A high-frequency circuit device includes a dielectric member 1, a shielding conductor 2 surrounding the dielectric member 1, a support member 3 for fixing and supporting the dielectric member 1, and a pair of transmission lines 4 each of which is formed of a microstrip-line. Each of the transmission lines includes a substrate 6 formed of a dielectric material, a strip conductor 5, and an earth conductor layer 9. An end portion of the strip conductor 5 faces part of the dielectric member 1 and functions as a coupling probe for input / output coupling. Each of the transmission lines 4 is formed of a strip line, a mictostrip line, a coplanar line or the like, and has low-loss when connected to a circuit board.

Description

[0001] The present invention relates to high-frequency circuit devices and modules for resonance used in radio-communication systems or other devices dealing with high-frequency signals.

[0002] Conventionally, high-frequency filters and other high-frequency circuit devices including a resonant body as a basic element are essential for communication systems. With a resonant body, among resonator bodies, using a dielectric material such as a high dielectric constant, low-loss ceramic material, a high-frequency circuit device functioning as a small and low-loss (high-Q) resonator can be achieved.

[0003] Such a resonator can be disposed with other circuit elements such as an amplifier, an oscillator, and a mixer circuit on a substrate to make a high-frequency circuit have a module configuration. In this case, a high-frequency signal needs to be input / output to / from the resonator via a transmission line such as a stripline on the substrate. As an example of such high-frequency circuits usi...

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